WO2008018231A1 - Bobine d'antenne et dispositif d'antenne - Google Patents

Bobine d'antenne et dispositif d'antenne Download PDF

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Publication number
WO2008018231A1
WO2008018231A1 PCT/JP2007/061771 JP2007061771W WO2008018231A1 WO 2008018231 A1 WO2008018231 A1 WO 2008018231A1 JP 2007061771 W JP2007061771 W JP 2007061771W WO 2008018231 A1 WO2008018231 A1 WO 2008018231A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
antenna
magnetic core
conductor
main surface
Prior art date
Application number
PCT/JP2007/061771
Other languages
English (en)
Japanese (ja)
Inventor
Hiroyuki Kubo
Hiromitsu Ito
Kuniaki Yosui
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Priority to CN2007800297054A priority Critical patent/CN101501929B/zh
Priority to EP07745058A priority patent/EP2051329A4/fr
Priority to JP2007557262A priority patent/JP4893631B2/ja
Publication of WO2008018231A1 publication Critical patent/WO2008018231A1/fr
Priority to US12/357,546 priority patent/US8259023B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/006—Printed inductances flexible printed inductors

Definitions

  • the present invention relates to an antenna coil for mobile communication and an antenna device including the antenna coil.
  • antenna is mounted on each of a portable electronic device such as a portable terminal and a reader / writer to exchange data with each other.
  • antenna coils are widely used as antennas mounted on portable electronic devices, in particular, to realize these demands for high performance, low cost, and downsizing.
  • Patent Document 1 discloses an antenna coil configured by mounting a flexible substrate having a coil conductor formed on a magnetic core.
  • FIG. 11 is a perspective view showing the structure of the invention described in Patent Document 1.
  • FIG. A single flexible substrate 503 having a coil conductor formed on the magnetic core 502 is mounted.
  • FIG. 12 is a plan view showing the main surface of the flexible substrate 503 before mounting in the invention described in Patent Document 1.
  • the flexible substrate 503 is bent, and the surfaces formed thereby are bonded to the main surface and the side surface of the magnetic core 502.
  • the first coil portion 504a and the second coil portion 502b are formed in the magnetic core 502.
  • the coil conductor refers to a line formed on a flexible substrate
  • the coil portion refers to an assembly of coil conductors that form a spiral shape.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-22912
  • the antenna coil described in Patent Document 1 is mounted on a circuit board
  • the antenna coil is usually mounted such that the main surface of the antenna coil is in contact with the main surface of the circuit board.
  • the user of the mobile terminal should Usually, the main surface of the portable terminal and the main surface of the reader / writer that are designed in parallel are placed so as to overlap each other in plan view.
  • the antenna coil 501 described in Patent Document 1 has a force capable of interlinking with a magnetic flux parallel to the main surface of the antenna coil 501 and a magnetic flux in a direction perpendicular to the main surface of the antenna coil 501. It was a force I could't interact with.
  • the coil conductor may be formed on substantially the entire main surface of the antenna coil 501. Therefore, the magnetic flux that can be captured by the antenna coil 501 is limited.
  • the winding directions of the first coil portion 504a and the second coil portion 504b are the same with respect to the same coil axis. Therefore, even if the magnetic flux enters the main surface of the antenna coil 501, when passing through the coil axes of the first coil portion 504a and the second coil portion 504b, the magnetic fluxes in the opposite direction are passed through the coil portions 504a and 504b. , And the voltage induced by that occurs in the opposite direction. Therefore, the induced voltage was canceled and it was difficult to ensure an optimal communication state.
  • an object of the present invention is to provide an antenna coil that is linked to a magnetic flux in a direction perpendicular to the main surface of the antenna coil and enables highly sensitive communication. .
  • the present invention is configured as follows.
  • the antenna coil of the present invention is formed of a flat magnetic core, a flexible substrate that is provided around the magnetic core and has a conductor formed on the surface, and a main surface of the magnetic core.
  • a first coil part having a coil axis parallel to the first coil part, a coil axis formed by a conductor and parallel to the main surface of the magnetic core, connected to the first coil part, and
  • the second coil part whose winding direction is opposite to that of the part and the non-winding part provided between the first coil part and the second coil part on the main surface of the magnetic core and where no conductor is formed It is characterized by providing these.
  • At least a central portion of the antenna coil is a non-winding portion of the conductor on the main surface of the magnetic core!
  • a conductor is formed on a side surface of the magnetic core in a direction in which the first coil portion and the second coil portion are arranged.
  • the magnetic core may be connected to the side surface of the magnetic core in the direction in which the first coil portion and the second coil portion are arranged.
  • the coil axes of the first coil portion and the second coil portion coincide with each other.
  • the non-winding portion is provided on the two main surfaces of the magnetic core,
  • a shielding electrode may be formed on one.
  • connection conductor formed of a conductor may connect the first coil portion and the second coil portion.
  • connection conductors may be formed.
  • the connection conductor is preferably provided with a notch.
  • At least one notch portion may be provided in the magnetic core.
  • the antenna device of the present invention includes a circuit board on which an antenna coil is installed so that the main surface of the magnetic core faces the main surface of the circuit board.
  • an uncoiled portion of the antenna coil is provided on at least one center line among the center lines that bisect each side of the main surface of the circuit board! /.
  • a conductor may be formed on the main surface of the circuit board.
  • An antenna coil can be easily manufactured by mounting a flexible substrate on a magnetic core.
  • a conductor non-winding portion is provided between the first coil portion and the second coil portion on the main surface of the magnetic core, and the winding directions of the first coil portion and the second coil portion are reversed. By doing so, it is possible to increase the communication sensitivity by linking with the magnetic flux in the direction perpendicular to the main surface of the antenna coil.
  • FIG. 1 is a perspective view showing a structure of an antenna coil according to a first embodiment.
  • FIG. 2 is a plan view showing the structure of the flexible substrate according to the first embodiment.
  • FIG. 3 is a perspective view showing a structure of an antenna device according to a second embodiment.
  • FIG. 4 is a schematic diagram showing a magnetic flux path in a state where the antenna apparatus shown in FIG. 3 is held over a reader / writer for an RFID system.
  • FIG. 5 is a perspective view showing a structure of an antenna coil according to a third embodiment.
  • FIG. 6 is a perspective view showing a structure of an antenna device according to a fourth embodiment.
  • FIG. 7 is a perspective view showing a structure of an antenna device according to a fourth embodiment.
  • FIG. 8 is a perspective view showing a structure of an antenna device according to a fifth embodiment.
  • FIG. 9 is a plan view showing the structure of a flexible substrate according to a fifth embodiment.
  • FIG. 10 is a plan view showing a structure of a circuit board according to a fifth embodiment.
  • FIG. 11 is a perspective view showing the structure of the antenna coil shown in the conventional example.
  • FIG. 12 is a plan view showing the structure of the flexible substrate shown in the conventional example.
  • FIG. 1 is a perspective view showing the structure of the antenna coil according to the first embodiment.
  • FIG. 2 is a plan view showing the structure of the flexible substrate before mounting on the magnetic core.
  • the antenna coil 1 includes a flat magnetic core 2 and a single flexible substrate 3 fitted around the magnetic core 2. .
  • a first coil portion 4a and a second coil portion 4b are formed at both ends of the antenna 1.
  • No conductor is formed between the first coil part 4a and the second coil part 4b on the main surface of the antenna coil 1.
  • the main surface of the antenna coil 1 is axisymmetric with respect to a center line that bisects the longitudinal direction. Therefore, the non-winding portion 5 is provided in the central portion of the main surface including the center line.
  • a coil conductor is formed on the side surface of the magnetic core 2 in the direction in which the first coil portion 4a and the second coil portion 4b are arranged.
  • a ferrite having a rectangular shape with a major surface of 40 mm in the longitudinal direction and a lateral direction of 10 mm and a thickness of 1.5 mm is used.
  • a conductor 4 is formed on the surface of the flexible substrate 3, and the first coil portion 4a and the second coil 4 are respectively formed on both sides of the magnetic core except for the central portion in the longitudinal direction. 4b is formed.
  • the first coil portion 4a and the second coil portion 4b are wound 6 turns each so that the magnetic core 2 is exposed by 1 mm on both sides in the longitudinal direction of the magnetic core 2!
  • the first coil part 4a and the second coil part 4b configured in this way have forces in which the winding directions are opposite to each other, and the coil axes of the two coil axes coincide with each other. Parallel to the longitudinal direction.
  • the first coil portion 4a and the second coil portion 4b are connected in series by the connecting conductor 6, and as a whole form one coil.
  • the shape of the flexible substrate 3 in plan view is a rectangle.
  • a protrusion 7 for connecting to the input / output terminal is formed on the upper side surface of the flexible substrate 3.
  • the material of the flexible substrate 3 is a polyimide film. Other glass-epoxy films and! /, Foldable electrical insulation films such as resin films can also be used.
  • six conductors 4 are formed on both sides except for the central portion. Each conductor 4 has a bent portion at the center thereof and contacts the lower end of the flexible substrate 3 but does not contact the upper end.
  • the two conductors located on the innermost side among the six conductors 4 on the left and right sides are connected by the connection conductors 6 near the upper end of the flexible substrate 3. Further, a conductor is formed between the upper end portion of the conductor 4 and the upper end portion of the flexible substrate 3, and the end portion of the protruding portion 7 is formed.
  • the conductor 4 can be formed by screen printing or etching.
  • the flexible substrate 3 formed as described above is mounted on the magnetic core 2 so that the upper end portion and the lower end portion of the adjacent conductors 4 are sequentially overlapped. At this time, the magnetic core 2 is sandwiched so that the surface on which the conductor 4 is formed is folded back so as to overlap.
  • the connected points (points 8 and 9) are electrically connected by soldering.
  • the conductor 4 is formed as a continuous coil.
  • the force that can be fixed around the magnetic core 2 by the solder that connects the ends of the conductor 4 The flexible substrate 3 can be stably manufactured by bonding the flexible substrate 3 and the magnetic core 2 with an adhesive or the like It is possible.
  • the antenna coil 1 As shown in FIG. 2, the antenna coil 1 according to the first embodiment configured as described above has a flexible substrate in which conductors are formed on both sides except the central portion, mounted on a magnetic core. Since the antenna coil is configured, a non-wound portion where no coil conductor is formed is formed on both the main surface and the opposite main surface of the antenna coil. Therefore, the magnetic flux from the outside can be captured by the main surface of the magnetic core 2.
  • the main surface of the antenna coil is installed in parallel to the main surface of the substrate of the mobile terminal.
  • the user of the mobile terminal When performing contactless communication with an external reader / writer, the user of the mobile terminal usually holds the main surface of the mobile terminal, which is designed parallel to the main surface of the board, over the reader / writer. Therefore, it is required that the main surface of the antenna coil can communicate with the reader / writer.
  • the antenna coil 1 shown in FIG. 1 is provided with a non-winding portion 5 on the main surface of the magnetic core 2 and meets the above-mentioned requirements.
  • the magnetic flux that has entered the non-winding portion 5 between the first coil portion 4a and the second coil portion 4b on the main surface of the magnetic core 2 bends in the traveling direction along the shape of the magnetic core 2. And passes through the coil axes of the first coil portion 4a and the second coil portion 4b.
  • the force that the magnetic flux in the opposite direction passes through the coil axes of the first coil part 4a and the second coil part 4b.
  • the first coil part 4a and the second coil part 4b have opposite winding directions. Therefore, a voltage in the same direction is induced.
  • the first coil part 4a and the second coil part 504b have the same size. A voltage is induced.
  • no coil conductor is formed on the side surface of the magnetic core 2 in the direction in which the first coil portion 4a and the second coil portion 4b are arranged. Therefore, the magnetic flux that has passed through the first coil portion 4a and the second coil portion 4b is radiated by the side force. Thus, the radiation path of the antenna coil 1 is improved by forming a path of magnetic flux from the main surface to the side surface.
  • the magnetic flux generated by the external force also enters from the side surface of the antenna coil 1.
  • the magnetic flux that entered After passing through the first coil portion 4a and the second coil portion 4b, the light is radiated from the non-winding portion 5 provided on the main surface of the antenna coil 1. Since the magnetic flux entering from the side has a different traveling direction from the magnetic flux entering from the main surface, the magnetic fluxes cancel each other by adding the vectors, but the main surface force usually enters the magnetic force much more than the side force enters the magnetic flux. Therefore, the magnetic flux that enters the antenna coil 1 and causes electromagnetic induction becomes relatively large. Therefore, highly sensitive communication is possible.
  • the antenna coil 1 is formed by mounting the flexible substrate 3 on the magnetic core 2, it can be easily manufactured.
  • the number of turns and the winding interval of the conductors of the first coil portion 4a and the second coil portion 4b are made equal, but the number of turns and the winding interval may be different.
  • each of the coil portions 4a and 4b may be a single loop or a loop of two or more turns.
  • the coil axis is not limited to a structure in which the coil axes of the first coil part 4a and the second coil part 4b are completely coincident with each other, and the coil axis is shifted depending on the shape of the magnetic core 2 and the formation method of the conductor 4. It doesn't matter.
  • the first coil part 4a and the second coil part 4b are connected in series. However, the first coil part 4a and the second coil part 4b can be changed by changing the connection location and the connection method. It is also possible to connect the coil part 4b in parallel.
  • FIG. 3 is a perspective view showing the structure of the antenna device according to the second embodiment.
  • an antenna coil 11 is mounted on a circuit board 17.
  • the circuit board 17 has, for example, a rectangular main surface with a length of 9 Omm in the longitudinal direction and a length of 40 mm in the short direction.
  • the length in the longitudinal direction of the antenna coil 11 and the length in the short direction of the circuit board 17 are the same, and the end in the long direction of the antenna coil 11 and the end in the short direction of the circuit board 17 are overlapped.
  • Antenna coil 11 is mounted.
  • the antenna coil 11 is fixed to the circuit board 17 using, for example, an adhesive.
  • the antenna coil 11 of the first embodiment Since the antenna coil 11 of the first embodiment is used, a description thereof is omitted here, but no protrusion is provided for connection to the input / output terminal. In this case, for example It is also possible to connect the conductor formed on the coil 11 and the conductor formed on the circuit board 17 and connect to the input / output terminal via the conductor formed on the circuit board 17.
  • the main surface of the circuit board 17 and the main surface of the magnetic core 12 are opposed to the circuit board 17, and the long side of the magnetic core 12 is parallel to the short side of the circuit board 17. As shown, the antenna coil 11 is installed.
  • ⁇ indicates the magnetic flux from the reader / writer 20.
  • the antenna device is installed so that the main surface of the mobile terminal and the circuit board of the antenna device are parallel.
  • the mobile terminal user holds the main surface of the mobile terminal parallel to the main surface of the reader / writer.
  • FIG. 4 shows the magnetic flux path from the reader / writer 20 and the cross-sectional structure of the antenna device when this type of usage is adopted.
  • the magnetic flux ⁇ from the reader / writer 20 is generated by the non-winding portion of the coil conductor provided between the first coil portion 14a and the second coil portion 14b of the antenna coil 11.
  • the entered magnetic flux not only follows the shape of the magnetic core 12 but is also blocked by the circuit board 17 existing behind the antenna coil 11 so that the traveling direction is bent by approximately 90 °. Then, it passes through the first coil part 14a and the second coil part 14b. Because the magnetic flux ⁇ of the reader / writer is in this path, the coil axis of the antenna coil 11 and the magnetic flux ⁇ from the reader / writer 20 are orthogonal to each other! The magnetic flux ⁇ can be captured and linked to cause electromagnetic induction. In particular, in the present embodiment, since the first coil portion 14a and the second coil portion 14b are formed around the magnetic core 12, respectively, the magnetic flux passes through the coil axis of each of the coil portions 14a and 14b. It has become. Therefore, voltage is likely to be induced.
  • Antenna coil 11 is installed.
  • the antenna coil by installing the antenna coil on the circuit board so as to satisfy X ⁇ Y ⁇ 0.8 mm, the end of the coil axis direction of the antenna coil approaches the end of the circuit board. Magnetism at the coil axial end Since the resistance can be reduced, the magnetic flux collection effect of the antenna coil is improved, and an antenna device having high communication sensitivity can be obtained.
  • the second embodiment satisfies the above inequality.
  • the main surface of the antenna coil 11 has a shape symmetrical with respect to the center line that bisects the longitudinal direction, and the non-winding portion 15 is formed in the main surface including the center line. Located in the center.
  • the center line that bisects the short direction of the circuit board 17 Therefore, the non-winding portion 5 of the antenna coil 11 is located at the same position.
  • the antenna coil 11 and the circuit board 17 are fixed with an adhesive.
  • the mounting method of the antenna coil on the circuit board is not limited to this. Absent. Further, even when the non-winding portion 5 of the antenna coil 11 is positioned on the center line that bisects the longitudinal direction of the circuit board 17, the same effects as in the present embodiment can be obtained.
  • FIG. 5 is a perspective view showing the configuration of the antenna coil 31 in which five connection conductors 36 are formed.
  • connection conductors 36a, 36b, 36c, 36d, 36e formed connection conductors 36a, 36b, 36c, 36d, 36e.
  • connection conductors 36a, 36b, 36c, 36d, 36e formed connection conductors located on the innermost side of the first coil part 34a and the second coil part 34b are connected to each other.
  • Each connection conductor is formed at equal intervals.
  • the structure of the antenna coil 31 excluding the connection conductor is configured in accordance with the first embodiment. However, there is no protrusion to connect to the input / output terminals.
  • the first coil portion 34a or The current path coming from the second coil section 34b is determined as one.
  • the length of the conductor 34 constituting each coil part is changed, and the connecting conductors 36b, 36c, 36d, 36e are cut. Therefore, when the current path is the connecting conductor 36a, the length of the conductor 34 constituting each coil portion is the shortest, and conversely, the connecting conductors 36a, 36b, 36c, 36d are cut to connect the current path to the connecting conductor. If it is 36e, it will be the longest.
  • the inductance value of the antenna coil 31 also changes. If the inductance value of the antenna coil 31 is changed, the resonance frequency of the resonance circuit composed of the antenna coil 31 and the capacitor can be adjusted. In the first place, in the antenna coil 31, a voltage is induced by the change of the magnetic flux passing through the coil section regardless of the resonance frequency, but a particularly large voltage is induced when the resonance frequency and the frequency of the entering magnetic flux are inconsistent. The Therefore, the voltage generated by adjusting the resonance frequency of the resonance circuit to a desired value is increased, and the communication sensitivity of the antenna is improved.
  • the antenna coil 31 is formed as shown in FIG. 5, since the inductance can be selected after the antenna coil 31 is manufactured, the communication sensitivity of the antenna can be improved very easily.
  • the connecting conductors 36a, 36b, 36c, 36d, and 36e are formed on the non-winding coil in which the magnetic flux from the reader / writer enters. These connecting conductors 36a, 36b, 36c, 36d, and 36e can impede the entrance of magnetic flux.
  • the ratio of the area where the connecting conductors 36a, 36b, 36c, 36d, and 36e are formed to the area of the unwinding part Therefore, the magnetic flux is considered to enter smoothly.
  • the resonance frequency of the resonance circuit composed of the antenna coil 31 and the capacitance is adjusted by cutting the connection conductor 36.
  • the resonance frequency is adjusted by cutting the magnetic core. It is possible.
  • the magnetic flux that has entered the antenna coil is bent along the shape of the magnetic core and travels in the direction of the first coil portion and the second coil portion.
  • the inductance value of the antenna coil is changed by changing the shape of the magnetic core serving as a magnetic flux path.
  • the resonance frequency of the antenna coil is determined by the inductance value, the resonance frequency can be adjusted by magnetic trimming. Further, it is possible to trim the connecting conductor and the magnetic core at the same time.
  • the antenna device is configured by mounting an antenna coil on a circuit board with a gap as shown in the following examples. Also, the antenna connector It is also peculiar to the present embodiment that a shielding electrode is formed on the surface of the film facing the circuit board. Other configurations that are not described in the following examples conform to the first embodiment. However, no protrusion is provided for connection to the input / output terminal.
  • FIG. 6 is a perspective view showing the structure of the antenna device according to the first embodiment.
  • a gap is formed between the antenna coil 41 and the circuit board 47.
  • the gap can be formed between the antenna coil 41 and the circuit board 47 by, for example, fixing the antenna coil 41 to a housing such as a portable terminal (not shown).
  • a shielding electrode 48 is formed on the surface of the magnetic core 42 that faces the circuit board 47.
  • the shielding electrode 48 completely covers the non-winding portion (not shown) on the surface of the magnetic core facing the circuit board 47 and the portion where the first and second coil portions 44a and 44b are formed. Is formed.
  • the shield electrode 48 is formed after applying a non-conductive adhesive or the like to the first and second coil portions 44a and 44b so as not to be electrically connected to the first and second coil portions 44a and 44b.
  • the circuit board 47 has a rectangular main surface having a length in the longitudinal direction of 90 mm and a length in the short direction of 40 mm, for example.
  • the antenna coil 41 is arranged so that the short side of the antenna coil 41 is parallel to the long side of the circuit board 47.
  • the gap between the circuit board 47 and the antenna coil 41 is 1 mm.
  • the shielding electrode 48 is formed on the surface of the magnetic core 42 facing the circuit board 47.
  • the magnetic flux that has entered the non-winding portion 45 on the main surface that does not face the circuit board 47, where no shielding electrode is formed goes straight and penetrates the magnetic core 42.
  • Opposing surface force Magnetic flux can be prevented from being radiated. Therefore, it is possible to generate a sufficient voltage in the first coil portion 44a and the second coil portion 44b that are linked with the magnetic flux having a directional force perpendicular to the main surface of the antenna coil 41. .
  • FIG. 7 is a perspective view showing the structure of the antenna device according to the second embodiment.
  • the antenna coil 51 is mounted on the circuit board 57 with a gap.
  • the antenna coil 51 includes magnetic cores 52b, 52c (hereinafter, referred to as the first magnetic core) that extend in a direction perpendicular to the coil axial direction on both end surfaces of the magnetic core 52a (hereinafter referred to as the first magnetic core).
  • the second magnetic core and the third magnetic core) are connected in series.
  • the length of the first magnetic core 52a in the longitudinal direction is 45 mm.
  • the other configurations of the first magnetic core 52a and the flexible substrate conform to the first embodiment. However, the protrusions for connecting to the input / output terminals are not formed.
  • the second magnetic core and the third magnetic core 52b, 52c each have a rectangular main surface having a longitudinal force S lOmm and a length in the short direction lmm, and a thickness of 3.5mm. .
  • the second magnetic body core and the third magnetic body cores 52b and 52c are bonded to the end surface of the first magnetic body core 52a in the coil axis direction.
  • the long side of the second magnetic core 52b overlaps the short side of the magnetic core 52a
  • the short side of the second magnetic core 52b is the first magnetic core 52a.
  • the shielding electrode 58 is formed on the surface of the first magnetic core 52a facing the circuit board 57, and covers the entire surface of the first magnetic core 52a.
  • the circuit board 57 has a major surface of 90 mm in the longitudinal direction and 45 mm in the lateral direction.
  • the antenna coil 51 is arranged so that the long side of the antenna coil 51 and the short side of the circuit board 57 are parallel to each other.
  • the gap between the circuit board 57 and the antenna coil 51 is lmm.
  • the shielding electrode 58 is formed on the first magnetic core 52a, even if a gap is provided between the antenna coil 51 and the circuit board 57, the first coil portion 54a and the second coil It will not be emitted without passing through part 54b.
  • the magnetic flux that has passed through the first and second coil portions 54a and 54b enters the second and third magnetic cores 52b and 52c, and is connected to the second and third magnetic cores 52b and 52c. Radiated from the side or edge.
  • the second magnetic core and the third magnetic cores 52b and 52c are formed at the end of the antenna coil 51, so that the magnetic resistance at the end is lowered. For this reason, the magnetic flux passing through the first coil portion 54a and the second coil portion 54b increases, and the voltage induced thereby increases. Therefore, communication with higher sensitivity is possible.
  • the same effect can be obtained even in other shapes such as a curved force side surface in which the connected second and third magnetic cores 52b and 52c are rectangular parallelepipeds. it can.
  • the three magnetic cores 52a, 52b, and 52c may be integrally formed. Further, a shielding electrode may be formed on the surface of the second magnetic core 52b and the third magnetic core 52c that are provided in series and facing the circuit board 57.
  • a gap is formed between the antenna coils 41 and 51 and the circuit boards 47 and 57.
  • the design freedom of the circuit boards 47 and 57 is increased.
  • the antenna coils 41 and 51 are bonded to the casing of the portable terminal to It is also possible to provide a gap between the two.
  • circuit boards 47, 57 are installed in the main housing, and antenna coils 41, 51 are installed in the sub housing.
  • the circuit boards 47 and 57 exist behind the antenna coils 41 and 51 when installed and folded with the mobile terminal in view of the reader / writer side force. It can also be formed.
  • the antenna devices 40 and 50 are installed on the mobile terminal. Increase design freedom.
  • the winding plate 55 and the first and second coinores 44a, 44b, 54a are arranged on the surface of the first magnetic core 42a, 52a facing the circuit boards 47, 57.
  • 54b Force to form shielding electrodes 48, 58 Covering shielding electrode 48, 58 force S Even if it is a structure that covers only non-winding parts 45, 55 or only coil parts 44a, 44b, 54a, 54b I do not care.
  • FIG. 8 is a perspective view showing the structure of the antenna device according to the fifth embodiment.
  • FIG. 9 is a plan view showing the structure of the flexible substrate used in the fifth embodiment.
  • FIG. 10 is a plan view showing the structure of a circuit board used in the fifth embodiment.
  • the coil part is comprised by the conductor formed in the flexible substrate and the circuit board.
  • the antenna coil 61 is bonded to the circuit board 67 so that the main surface of the circuit board 67 and the main surface of the antenna coil 61 face each other. Is made up of.
  • the antenna coil 61 is formed with a first coil portion 64a and a second coil portion 64b, and a non-winding portion 65 in which no conductor is formed between the main surface of the antenna coil 61 is formed. Further, no conductor is formed on the side surfaces of the first coil portion 64a and the second coil portion 64b of the antenna coil 61 in the coil axis direction.
  • FIG. 9 shows the structure of the flexible substrate 63 before being mounted on the magnetic core.
  • the flexible substrate 63 has six conductors 64 formed on the left and right sides.
  • the conductors 64 except for the two conductors located near both ends of the flexible substrate 63 are in contact with the upper end and the lower end of the flexible substrate 63, respectively.
  • two conductors 69a and 69b for connecting to the input / output terminals are formed on the two conductors located near both ends of the flexible substrate 63.
  • the flexible substrate 63 formed in this way covers the main surface and two side surfaces of the magnetic core 62 and a part of the opposite main surface, and the magnetic core 62 is formed so that the surface on which the conductor 64 is formed is on the outside. Be dressed.
  • the circuit board 67 shows the structure of the circuit board 67 before the antenna coil is mounted.
  • the circuit board 67 is also formed with six conductors 74 on the left and right. Of these, the innermost two are connected by a connection conductor 66 formed on the circuit board 67.
  • the circuit board 67 configured as described above includes the end of the conductor 74 formed on the circuit board 67, for example, the point 71, and the end of the conductor 64 formed on the flexible board described above, for example, the point 70.
  • the antenna coil 61 are bonded so that they overlap each other.
  • the conductor is formed as a series of coils having a first coil part 64a and a second coil part 64b.
  • the antenna coil 61 having the first coil portion 64a, the second coil portion 64b, and the non-winding portion 65 formed therebetween is manufactured. Therefore, high-sensitivity communication can be realized by satisfactorily interlinking with the magnetic flux in the direction perpendicular to the main surface of the antenna coil 61.

Abstract

La présente invention a trait à une bobine d'antenne (1) formée en enroulant une carte souple (3) autour d'un noyau magnétique (2). Un conducteur est formé sur la carte souple (3) pour former une première section de bobine (4a) et une seconde section de bobine (4b) sur les deux côtés du noyau magnétique (2) à l'exclusion de la section centrale. Une partie située entre la première section de bobine (4a) et la seconde section de bobine (4b) qui se trouvent sur la surface principale du noyau magnétique (2) est une section non enroulée (5) où le conducteur n'est pas formé. La bobine d'antenne est liée à un flux magnétique dans la direction perpendiculaire à la surface principale de la bobine d'antenne pour établir des communications hautement sensibles.
PCT/JP2007/061771 2006-08-09 2007-06-12 Bobine d'antenne et dispositif d'antenne WO2008018231A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN2007800297054A CN101501929B (zh) 2006-08-09 2007-06-12 天线线圈及天线装置
EP07745058A EP2051329A4 (fr) 2006-08-09 2007-06-12 Bobine d'antenne et dispositif d'antenne
JP2007557262A JP4893631B2 (ja) 2006-08-09 2007-06-12 アンテナ装置
US12/357,546 US8259023B2 (en) 2006-08-09 2009-01-22 Antenna coil and antenna device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-217198 2006-08-09
JP2006217198 2006-08-09

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/357,546 Continuation US8259023B2 (en) 2006-08-09 2009-01-22 Antenna coil and antenna device

Publications (1)

Publication Number Publication Date
WO2008018231A1 true WO2008018231A1 (fr) 2008-02-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/061771 WO2008018231A1 (fr) 2006-08-09 2007-06-12 Bobine d'antenne et dispositif d'antenne

Country Status (5)

Country Link
US (1) US8259023B2 (fr)
EP (1) EP2051329A4 (fr)
JP (1) JP4893631B2 (fr)
CN (1) CN101501929B (fr)
WO (1) WO2008018231A1 (fr)

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JP2015513820A (ja) * 2012-02-13 2015-05-14 クアルコム，インコーポレイテッド スルーガラスビアを使用する３ｄｒｆｌ−ｃフィルタ
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CN107527713A (zh) * 2017-10-25 2017-12-29 德清明宇电子科技有限公司 一种多间距磁环壳及磁环组件
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JP5625813B2 (ja) * 2010-08-12 2014-11-19 株式会社村田製作所 通信端末装置
JP5758909B2 (ja) * 2010-10-12 2015-08-05 株式会社村田製作所 通信端末装置
JP5660254B2 (ja) * 2012-05-28 2015-01-28 株式会社村田製作所 アンテナ装置及び無線通信装置
WO2014045518A1 (fr) * 2012-09-18 2014-03-27 パナソニック株式会社 Antenne, dispositif d'envoi, dispositif de réception, circuit intégré tridimensionnel, et système de communication sans contact
US8973252B2 (en) 2012-09-27 2015-03-10 Toyota Motor Engineering & Manufacturing North America, Inc. Folded planar Litz wire and method of making same
WO2014085659A1 (fr) * 2012-11-28 2014-06-05 The Board Of Trustees Of The University Of Alabama For And On Behalf Of The University Of Alabama Antennes magnétiques à double polarisation
US10505269B2 (en) 2013-04-28 2019-12-10 The Board Of Trustees Of The University Of Alabama For And On Behalf Of The University Of Alabama Magnetic antenna structures
US10699842B2 (en) * 2014-09-02 2020-06-30 Apple Inc. Magnetically doped adhesive for enhancing magnetic coupling
US10033101B2 (en) * 2015-06-12 2018-07-24 Samsung Electronics Co., Ltd. Near field communication antenna, near field communication device and mobile system having the same
KR20170136316A (ko) * 2016-06-01 2017-12-11 삼성전기주식회사 무선 통신 안테나 및 이를 포함하는 웨어러블 기기
JP2019009327A (ja) * 2017-06-27 2019-01-17 イビデン株式会社 コイル
CN210576467U (zh) * 2018-02-16 2020-05-19 株式会社村田制作所 天线装置以及电子设备

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JP2011166810A (ja) * 2011-04-18 2011-08-25 Nec Tokin Corp アンテナ装置、通信モジュール、携帯電子機器及びそれを利用した通信方法
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JP2015513820A (ja) * 2012-02-13 2015-05-14 クアルコム，インコーポレイテッド スルーガラスビアを使用する３ｄｒｆｌ−ｃフィルタ
CN107527713A (zh) * 2017-10-25 2017-12-29 德清明宇电子科技有限公司 一种多间距磁环壳及磁环组件
CN111834750A (zh) * 2019-04-15 2020-10-27 沙夫纳 Emv 股份公司 天线

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JP4893631B2 (ja) 2012-03-07
CN101501929B (zh) 2012-12-05
CN101501929A (zh) 2009-08-05
EP2051329A4 (fr) 2010-11-03
JPWO2008018231A1 (ja) 2009-12-24
US20090121955A1 (en) 2009-05-14
EP2051329A1 (fr) 2009-04-22
US8259023B2 (en) 2012-09-04

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